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<div class="section" id="concepts">
<h1><a class="toc-backref" href="./sequences.html#id1394">Concepts</a></h1>
<p id="label-sequences-concepts">The taxonomy of sequence concepts in MPL parallels the taxonomy of the MPL
<a class="reference internal" href="./iterators.html">Iterators</a>, with two additional classification dimensions:
<cite>extensibility</cite> and <cite>associativeness</cite>.</p>
<!-- The latter two are orthogonal to
sequence traversal characteristics, but not to each other, meaning that
a sequence can be characterized as both `Bidirectional`__
and `Back Extensible`__, or `Bidirectional`__ and
`Extensible Associative`__, but not as `Bidirectional`__,
`Back Extensible`__ *and* `Extensible Associative`__.

__ `Bidirectional Sequence`_
__ `Back Extensible Sequence`_
__ `Bidirectional Sequence`_
__ `Extensible Associative Sequence`_
__ `Bidirectional Sequence`_
__ `Back Extensible Sequence`_
__ `Extensible Associative Sequence`_


Two utility concepts, |Variadic Sequence| and |Integral Sequence Wrapper|,
are not applicable in generic contexts, but are used to group together
the common parts of different sequence classes' specifications. -->
<!-- Sequences/Concepts//Forward Sequence |10 -->
<ul class="toc simple" id="outline">
<li><a class="reference internal" href="./forward-sequence.html" id="id1395">Forward Sequence</a></li>
<li><a class="reference internal" href="./bidirectional-sequence.html" id="id1396">Bidirectional Sequence</a></li>
<li><a class="reference internal" href="./random-access-sequence.html" id="id1397">Random Access Sequence</a></li>
<li><a class="reference internal" href="./extensible-sequence.html" id="id1398">Extensible Sequence</a></li>
<li><a class="reference internal" href="./front-extensible-sequence.html" id="id1399">Front Extensible Sequence</a></li>
<li><a class="reference internal" href="./back-extensible-sequence.html" id="id1400">Back Extensible Sequence</a></li>
<li><a class="reference internal" href="./associative-sequence.html" id="id1401">Associative Sequence</a></li>
<li><a class="reference internal" href="./extensible-associative-sequence.html" id="id1402">Extensible Associative Sequence</a></li>
<li><a class="reference internal" href="./integral-sequence-wrapper.html" id="id1403">Integral Sequence Wrapper</a></li>
<li><a class="reference internal" href="./variadic-sequence.html" id="id1404">Variadic Sequence</a></li>
</ul>
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